Some of the really, really old DVRs might be affected (i.e. the Dishplayer 7200) but anyone who still has one has been offered upgrades at virtually no cost. If they didn’t take it, then thats their own fault.
Any of the new(er) DVR’s won’t be affected (i.e. 501, 508, 510, 522, 625, 622, 722, 612).